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Inductance Formula:
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Inductance is the property of an electrical conductor that opposes a change in current. It's measured in henries (H) and depends on the geometry of the coil and the magnetic permeability of the core material.
The calculator uses the inductance formula:
Where:
Explanation: The inductance increases with the square of the number of turns and is directly proportional to the core's permeability and cross-sectional area, while inversely proportional to the coil length.
Details: Accurate inductance calculation is crucial for designing circuits, transformers, motors, and other electromagnetic devices. It helps predict how a component will behave in AC circuits and its energy storage capacity.
Tips: Enter all values in the specified units. Number of turns must be a whole number. Permeability values range from about 1.26×10⁻⁶ H/m (air) to much higher values for ferromagnetic materials.
Q1: What is typical permeability for common materials?
A: Air/vacuum: ~1.26×10⁻⁶ H/m, Iron: ~6.3×10⁻³ H/m, Ferrite: ~2.5×10⁻⁴ to 1.26×10⁻² H/m.
Q2: How does coil shape affect inductance?
A: The formula assumes a solenoid. Other shapes (toroid, flat spiral) have different inductance formulas.
Q3: What if my coil has multiple layers?
A: The formula becomes more complex. Additional factors like winding pitch and inter-layer distance must be considered.
Q4: How accurate is this calculation?
A: It's accurate for ideal solenoids. Real-world factors like winding imperfections and core saturation may affect actual inductance.
Q5: What's the difference between self and mutual inductance?
A: This calculator computes self-inductance. Mutual inductance involves the interaction between two coils.